Fire-alarm



' iJNi'rED s'r-ArEs i AiENT OFFICE.

JAHEST. DEL-A NY, 0F BBIDGEPOBT, CONNECTICUT, ASSIGNOB T0 THE EHCA MANU- FACTUBING CODANY, 0F BBIDGEPOBT, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

FIRE-ALADI.

Bpecition of Letters Patent.

Patented Oct. 26, 1920.

Applitiol med October 9, 1919. Serial No. 889,476.

To all whom it may concern: V

Be it known that I, J Ain-:s T. Di-iLANaY, a citizen of the United States, residing at Bridgeport, county 'of Fairfield, State of Connecticut, hiwe invented an Improvement iii Fire-Alarms, of which the following is a specification. l

This invention relates to the class of fire alarms. illustrated and described iii patent to Bowman, No. 11162.020, dated November 30. 1915, said alarms being adapted for general use as in homes. factories, warehouses and garages, in fact wherever life and'property are in danger from fire, and the invention has for its object to so change and improve Vthe construction of said alarms as to greatly increase their reliability and render their operation practically certain for a long period of time and without any atten 'tion whatever.

With these and other objects in view, I have devised the novel fire alarm which I will now describe referring to Athe accompanying drawing forming a part of this specification and using reference characte to indicate the several parts.

Figure 1 is afront elevation of my novel alarm as in use;

Fig. 2 a corresponding vertical section;

3 a view showing the alarm in side elevation and in connection therewith a diagrammatic view of an electric bell, battery and wiring system; and

Fig. 4 is a detail sectiontl view on an enlarged scale. v

It should be understood that the invention lies in the special heat operated means shown and described for causing any preferred form of signaling apparatus to operate and that it is immaterial so far `as the present invention is concerned what special -form of electrically operated noise producing or other signaling apparatus is used. In the 'present instance I have shown 'an electric bell or buzzer, indicated by 10, a conventional wiring system, indicated by 11, and a battery, indicated by 12.

The parts of my lpresent invention are carried by an insulating base board 13A tively large central opening indicated by 18, and comprises a sleeve 19 which is adapted to slide freely within the case, either cap, or case, or bothvbeing made of non-oxidizable metal or rendered non-oxidizable so as to insure that the ca will not stick in the case when released. l ithin the case and compressed between the cap and the bottom is a relatively strong spring 20;l

which incloses and grips the case and is se.

cured to the base board by screws 24.

Above the case is a contact member 25 which may be sim ly a strip of metal secured to` the insulating base board by screws 26. The free end of the strip is bent outward away from the base board and then downward, the opposite edges of the strip being beveled 0H so as to form an angular tongue 27, which will pass into opening 18 in the cap when the latter is released and engage both sides of the opening, as clearly shown in Fig. 2, thus insuring effective electricall connection. The electric circuit is completed by attaching one of the wires to one of the clip screws 24 and the 'other wire to one of the retaining screws'26 for the contact member.

The parts will remain in the position shown in Figs. 1, 3 and 4 under ordinary conditions, the circuit being open. A retaining material is used that will melt or soften suiciently to release the cap at a predetermined temperature. Should the air in the room reach this temperature, from any cause whatever, the melting or softening of the retaining material will release the cap and permit the spring to raise the cap into engagement with the contact member, thus closing the circuit. As the oontact member and the sleeve retain the cap in en gement with the case the circuit will remain closed until the alarm has effected its purpose and the circuit is opened again alarms are used in parallel. 'lhe ellect of the relatively large openings in' the bottom of the caseand the cap is to start a drai't through the case as soon as the temperature in the room commences to rise. This I find a very important advantage in lpractically insuring the operationof the alarm at the predetermined temperatureand eliminating the danger of premature or delayed operation.

Having thus describedY my invention, I claim:

l. A lire alarm comprising a ease having v a hole, a spring in the case, a cap adapte to be raised by the spring and having a sleeve passing within the ease and below the hole, low melting retaining material in the hole and in contact with the sleeve, and a Contact member adapted to be enga ed by the cap when the latter is released `t rough melting of the retainin material, the bottom of the ease and cap eing provided with,

openings.

2. lire alarm comprising a tubular case, a spring therein, a cap adapted to be raised by the spring, low melting retainin material by which the cap is secured to te case and the s ring held compressed, and a contact mem eradapted to be engaged by the cap when the latter is raised by the spring, the bottom of the case and the cap being provided with relatively large openings to insure draft therethrough when the temperature rises.

3. A fire alarm comprising a tubular case, a spring therein, a cap, low melting retaining material between the cap and the case, and a Contact member having a downwardly extending beveled edge, the bottom of the case and the cap being provided with openings and the opening in the cap being engaged by the projection on the contact member when the cap is released by melting of the retaining material. l

In testimony 'whereof I aflix m si ature.

JAMES T. DE A EY. 

